HCS08 datasheet(29/290 Pages) MOTOROLA

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Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

MC9S08GB/GT

For information about controlling these pins as general-purpose I/O pins, see the Parallel Input/Output

section. For information about how and when on-chip peripheral systems use these pins, refer to the

appropriate section from Table 2-1.

When an on-chip peripheral system is controlling a pin, data direction control bits still determine what is

read from port data registers even though the peripheral module controls the pin direction by controlling

the enable for the pin’s output buffer. See the Parallel Input/Output section for more details.

Pullup enable bits for each input pin control whether on-chip pullup devices are enabled whenever the pin

is acting as an input even if it is being controlled by an on-chip peripheral module. When the PTA7–PTA4

pins are controlled by the KBI module and are configured for rising-edge/high-level sensitivity, the pullup

enable control bits enable pulldown devices rather than pullup devices. Similarly, when IRQ is configured

as the IRQ input and is set to detect rising edges, the pullup enable control bit enables a pulldown device

rather than a pullup device.

Table 2-1 Pin Sharing References

Port Pins

Alternate

Function

Reference(1)

NOTES:

1. See this section for information about modules that share these pins.

PTA7–PTA0

KBI7–KBI0

Keyboard Interrupt (KBI) Module

PTB7–PTB0

AD7–AD0

Analog-to-Digital Converter (ATD) Module

PTC7–PTC4

—

Parallel Input/Output

PTC3–PTC2

SCL–SDA

Inter-Integrated Circuit (IIC) Module

PTC1–PTC0

RxD2–TxD2

Serial Communications Interface (SCI) Module

PTD7–PTD3

TPM2CH4–

TPM2CH0

Timer/PWM (TPM) Module

PTD2–PTD0

TPM1CH2–

TPM1CH0

Timer/PWM (TPM) Module

PTE7–PTE6

—

Parallel Input/Output

PTE5

PTE4

PTE3

PTE2

SPSCK

MISO

MOSI

Serial Peripheral Interface (SPI) Module

PTE1–PTE0

RxD1–TxD1

Serial Communications Interface (SCI) Module

PTF7–PTF0

—

Parallel Input/Output

PTG7–PTG3

—

Parallel Input/Output

PTG2–PTG1

EXTAL–XTAL

Internal Clock Generator (ICG) Module

PTG0

BKGD/MS

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